Magnetic position device

Abstract

A magnetic position device for using in a driver is provided. The magnetic position device includes a movable element having a first yoke assembly, and a fixed element adjacent to the movable element for generating a magnetic field to control the movable element to be moved toward a predetermined position.

What we claim is:  
     
         1 . A magnetic position device for using in a driver, comprising: 
 a movable element having a first yoke assembly; and    a fixed element adjacent to said movable element for generating a magnetic field to control said movable element to be moved toward a predetermined position.    
     
     
         2 . The magnetic position device according to  claim 1 , wherein said fixed element comprises: 
 a second yoke assembly;    a magnet assembly connected to said second yoke assembly for generating said magnetic field;    a first coil for generating a first motive force in a first direction in response to the magnetic flux of said magnetic field; and    a second coil for generating a second motive force in a second direction in response to the magnetic flux of said magnetic field.    
     
     
         3 . The magnetic position device according to  claim 2 , wherein said second coil is perpendicular to said first coil.  
     
     
         4 . The magnetic position device according to  claim 2 , wherein said second direction is perpendicular to said first direction.  
     
     
         5 . The magnetic position device according to  claim 2 , wherein said first coil and said second coil are winded around said second yoke assembly.  
     
     
         6 . The magnetic position device according to  claim 2 , wherein said magnet assembly comprises a plurality of permanent magnets.  
     
     
         7 . The magnetic position device according to  claim 2 , wherein said movable element is capable of being moved along said first direction by said first motive force acted on said first yoke assembly.  
     
     
         8 . The magnetic position device according to  claim 7 , wherein said movable element is capable of being moved along said second direction by said second motive force acted on said first yoke assembly.  
     
     
         9 . The magnetic position device according to  claim 8 , wherein said first coil is a tracking coil.  
     
     
         10 . The magnetic position device according to  claim 9 , wherein said second coil is a focusing coil.  
     
     
         11 . The magnetic position device according to  claim 1 , wherein said first yoke assembly comprises two yokes being mounted on two opposite sides of said movable element, respectively.  
     
     
         12 . The magnetic position device according to  claim 1 , wherein said driver is a read/write head of an optical read device.  
     
     
         13 . The magnetic position device according to  claim 12 , wherein said movable comprises an optical lens  
     
     
         14 . A magnetic position device for using in a driver, comprising: 
 a movable element having a first yoke assembly; and    a fixed element adjacent to said movable element for generating a magnetic field and having a coil assembly, wherein said coil assembly generates a motive force in response to the magnetic flux of said magnetic field to control said movable element to moved toward a predetermined position.    
     
     
         15 . The magnetic position device according to  claim 14 , wherein said coil assembly comprises a focusing coil and a tracking coil.  
     
     
         16 . The magnetic position device according to  claim 14 , wherein said fixed element further comprises a second yoke assembly and a magnet assembly connected with said second yoke to generate said magnetic field.  
     
     
         17 . A position device capable of controlling the position of an optical lens for using in a driver, comprising: 
 a movable element having a first yoke assembly; and    a fixed element adjacent to said movable element for generating a magnetic field and having a coil assembly, wherein said coil assembly generates a motive force in response to the magnetic flux of said magnetic field, thereby controlling said optical lens to moved toward a predetermined position.    
     
     
         18 . The position device according to  claim 17 , wherein said optical lens is mounted in said movable element.